Manhole cover and frame



P 1933. c. J. HARTLEY MANHOLE COVER AND FRAME Filed Sept. 30, 1932 3Sheets-Sheet l r I v Sept. 5, 1933. C J HARTLEY 1,925,635

MANHOLE COVER AND FRAME Filed Sept. 30, 1932 3 Sheets-Sheet 2CiJf/awZZey Sept. 5, 1933. r c. J. HARTLEY 1,925,635

MANHOLE COVER AND FRAME Filed Sept. 50, 1952 s Sheets-Sheet 5 its thirdcorner.

Patented Sept. 5, 1933 Umrsp STA v MANHOLE COVER AND FRAME Cyril JohnHartley, Stoke-upon-Trent, England Application September 80, 1932,

Serial No.

635,691, and in Great Britain September 8,

2 Claims.

The invention relates to improvements in covers for sewers, drains orunderground conduits or gratings for gullies or the like, the termmanhole cover being used hereinafter to include any of the above orsimilar covers or gratings.

A manhole cover according to the invention possesses several advantagesover the usual form of cover. It is light, easily raised about itspivots and does not rock in its frame.

These advantages are obtained by the manhole cover being of triangularform and having pivots situated adjacent to two of its corners, so thatit can be easily raised from its frame about these pivots by theoperator lifting the cover at or near Rocking of the cover is avoided bythe provision in the frame of three points of support for thecover,these points of support, for example, being in the form of pads in theframe adapted to receive and preferably correspond to Ibosses on thecover adjacent to the corners thereof, two of said bosses constitutingthe pivots of the cover.

The invention also includes details hereinafter described and pointedout in the appended claims.

In the accompanying drawings:

Figure 1 is a plan of one form of triangular cover in closed position inits frame.

Figure 2 is a plan of the frame with the cover removed.

Figure 3 is a sectional elevation on III-III, Figure 1,

Figure 1 being a similar cover in the open position.

Figure 5 is a plan of a portion of another 4 form of frame and cover,

Figure 6 being a sectional elevation on VIVI, Figure 5.

Figure '7 is a plan of a further form of frame and cover, only half ofthe cover being shown in the lower half of the figure.

Figure 8 is a sectional elevation on VIIIVIII, Figure '7.

In the form of the invention illustrated by Figures 1 to 4, a cover 1 ofsubstantially triangular shape in plan is inserted in a correspondinglyshaped frame 2 having a flanged base 3.

The triangular cover 1 has three bosses 4, 5 and 6, which rest on threepoints of support or pads 7, 8 and 9 on the frame 2. The bosses 5 and 6are cylindrical and the pads 8 and 9 have cylindriview, but with the calbearing surfaces to receive them. The boss 4' has a fiat undersurface tobear onthe corresponding upper bearing surface of the pad 7.

The cover 1, when in the closed position, is thus firmly supported at oradjacent to its three corners and has no tendency to rock.

The bosses 5 and 6 act as pivots for the cover 1 when it is raised, forexample, by a key inserted in a key-hole 10 near the corner remote fromsaid pivots, the triangular form of the cover 1 rendering this raisingor pivotal action much easier than would be the case if the cover wereof square or rectangular form.

A retaining pin 11 passes through the bosses 5 and 6 and the adjacentparts of the frame 1, the holes 12 in the bosses being of greaterdiameter than that of the pin to allow plenty of clearance between thepin 11 and the bosses 5 and 6, in order that the bosses bear on the pads8 and 9 and not on the pin.

The pin, as shown in Figure 1, may have nuts 13, but its ends may simplypenetrate into slots 14 in the adjacent parts of the frame 2, as shownin Figures 5 and 6, so that the cover may be removed entirely from theframe if required, without necessitating removal of nuts.

In the form shown in Figures '7 and 8, the bosses 5 and 6 have laterallyprojecting lugs 1 15, 15, penetrating into slots 16, 16, in the adjacentparts of the frame 2. The slots 16, 16, are of invert form. When thecover 1 is in the closed position, the'lugs15, 15, are at the upper endsof the slots 16, 16, as indicated in full lines in the lower part ofFigure '7 and inFigure 8. The lugs 15 thus close the slots against entryof dirt. When the'cover is raised about its pivotal bosses 5 and 6, thelugs 15 then move in the slots 16 to the position indicated by dottedlines at 15', Figure 8, and retain the cover in its raised position, asshown in dotted lines at 1. When the cover 1 is again lowered, the lugs15 return into the upper parts of the slots 16, ejecting any dirt whichmay have entered while the cover was raised.

The triangular cover is easily lifted, as it is not only light and wellbalanced, but the V shaped lifting corner offers less frictionalresistance than does a square or rectangular cover when the spacebetween theedges of the cover and the frame is clogged with dirt orrust.

I claim: a

1. In combination, a triangular manhole cover, a frame therefor,bossescarried by and depending below the manhole cover at the respectiveends of one side of said cover, pads on the frame to provide bearingsupports for the bosses in all relative positions of the cover, meansfor pivotally connecting the frame and cover, a boss depending from thecover at the meeting ends of the cover relative to the frame, means forpivotally connecting the cover and frame, a pad on the frame having arelatively fiat bearing surface, and a depending boss at the apex of thecover having a flat bearing surface to cooperate with the fiat bearingsurface of the last named pad.

CYRIL JOHN HARTLEY.

